It's quarantine, for 2 weeks at most. There is nothing new or sinister about this. No one likes it. People are not forced to come to Australia so they are not compelled to quarantine.
Your response is typical of the exaggerated and misleading rubbish spouted routinely by conspiracy theorists. Quarantine has been method of disease control since at least the 14th century when the plague was rife. You think it's a problem now? Consider passengers on a ship who have no choice but to stay in a plague ridden ship until everyone dies or recovers. And with no treatment.
Isolation of lepers goes back to Old Testament times. God initiated quarantine, just a little different from what we have now. Got Questions has this to say:
"Incurable by man, many believed God inflicted the curse of leprosy upon people for the sins they committed. In fact, those with leprosy were so despised and loathed that they were not allowed to live in any community with their own people (
Numbers 5:2). Among the sixty-one defilements of ancient Jewish laws, leprosy was second only to a dead body in seriousness. A leper wasn’t allowed to come within six feet of any other human, including his own family. The disease was considered so revolting that the leper wasn’t permitted to come within 150 feet of anyone when the wind was blowing. Lepers lived in a community with other lepers until they either got better or died. This was the only way the people knew to contain the spread of the contagious forms of leprosy."
Leprosy is curable now.